Dermatomyositis is one of a group of acquired muscle diseases called inflammatory myopathies. The disease, which
has a subacute (somewhat short and relatively severe) onset, affects both children and adults. Females are more often
affected than males. Dermatomyositis is characterized by a rash accompanying, or more often, preceding muscle
weakness. The rash is described as patchy, bluish-purple discolorations on the face, neck, shoulders, upper chest,
elbows, knees, knuckles, and back.

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